KR100426250B1 - The test equipment of static loading on a pile and its method, using the sand compaction pile ship on the marine - Google Patents

Abstract

PURPOSE: A static load testing device of a pile using a floating sand compaction pile construction plant and a method thereof are provided to reduce the measuring period and to improve the working efficiency by measuring the position, moving easily and testing the static load quickly. CONSTITUTION: A static load testing device(100) of a pile is composed of installation members(111,111a) combined with the inside of casing of a floating sand compaction pile construction plant by welding; a loading body(110) combined between the installation members; a hydraulic member(130) installed in the lower center of the loading body; and a compression member(140) placed in the lower part of the hydraulic member and moved up and down by operating the hydraulic member. Reinforcing members(120,120a) are mounted diagonally in the upper part of the loading body.

Description

The test equipment of static loading on a pile and its method, using the sand compaction pile ship on the marine}

The present invention relates to a static load test apparatus and a method thereof for infiltrating piles in order to reinforce the undersea soft ground, and in particular, it is mounted on the casing of the offshore sand compact pile working ship to enable the static load test of the piles infiltrated on the sea bottom. It is possible to measure the construction quality quickly and accurately, and also to reduce the test period for standing, and relates to a pile standing testing apparatus and method using the offshore sand compaction pile working line to maximize the efficiency of the work.

In general, a sand compaction pile working ship has a three-axis casing for reinforcing the soft ground of the seabed, and after the casing is inserted into the seabed, the filling member in the casing ( Sand or crushed stone) is added and placed by vibration hammer to strengthen piles.

Next, the allowable bearing capacity (vertical bearing force, principal friction, horizontal resistance), anticipated bearing force, and external force can be measured for piles infiltrated for the purpose of reinforcing soft ground, and the data necessary for basic design of the structure to be installed later can be provided. At the same time, the static load test with static load must be conducted to examine the stability of the structure. To do this, the load condition of the pile is applied so that the form of the load delivered to the constructed pile receives a load close to three times the actual allowable load. By setting up the most similar environment, measuring pile displacement accordingly, and determining the bearing capacity of piles using various analysis methods, construction quality and poor construction can be prevented in advance.

However, the static load test up to now is a method of measuring the bearing capacity of piles by applying a step load while placing heavy materials or caissons having a permissible load close to three times the actual permissible load on the top of the piles penetrated to the sea floor and leaving them for a certain period of time. In the conventional static load test, the weight of the test remains in the seabed for a long time, and thus the positional change of the loaded weight due to the flow and settlement of the sea bottom caused by frequent climate change and the rapid flow of seawater is This is a disadvantage that it is difficult to accurately measure the displacement amount of the pile.

In addition, the conventional static load test is not able to transfer a uniform load to the entire pile to obtain accurate measurement data has a very serious closure of the construction work as well as deterioration of construction quality.

Moreover, in order to install and dismantle the heavy materials, the workers must be put in the water, but it is not easy to carry out the measurement work in the water where the visibility is not secured, and the risk of safety accidents of the workers is very high.

In addition, since the measured value can be obtained only if the weight is left for a certain period of time, there is a serious closure which results in a prolonged period of unloading test, as well as a reduction in the efficiency of the operation and a double economic burden.

Therefore, the present invention was devised to solve the drawbacks of the above problems, the present invention utilizes the marine sand compaction file working ship as it is, the working ship itself is used as a test device for standing, but the marine sand compaction The static load test device coupled to the casing of the pile working ship enables rapid static load test, thereby improving the convenience and efficiency of the static load test.

1-an exploded perspective view for illustrating a pile static load test apparatus using the present invention marine sand compaction pile working ship.

Figure 2-a perspective view for showing a pile static load testing apparatus using the present invention marine sand compaction pile work line.

3-reference state of use of the present invention.

Figure 4 is a reference diagram for showing the pile static load test method using the present invention marine sand compaction pile working line for each process.

* Explanation of symbols for main parts of the drawings

100: pile static load test device using the present invention marine sand compact pile working ship (hereinafter referred to as static load test device)

110: loading body 111: mounting member

111a: curved portion 112: casing seating portion

120, 120a: reinforcing member 121: mounting member

121a: curved surface

130: hydraulic member

140: compression member

141: reinforcing plate 142: drain hole

A: offshore sand compaction file

B: Casing No. 1 C: Casing No. 2

D: Casing No. 3 E: Pile

As described above, the present invention static load test apparatus 100 is coupled to the marine sand compaction pile working line to enable static load testing as follows.

That is, the mounting members 111 and 111a welded to the inner surfaces of the first casing B and the third casing D formed under the vibro hammer of the marine sand compact pile working line A, and the mounting member ( The loading body 110 coupled between the 111 and 111a, the hydraulic member 130 mounted at the lower center of the loading body, and the compression member positioned below the hydraulic member and movable up and down by operation of the hydraulic member ( 140).

The loading body 110 is to support and withstand the allowable load close to three times the actual load applied to the pile E by the hydraulic member 130, the load applied to the loading body 110 Reinforcing members 120 and 120a may be formed on the upper portion of the loading main body 110 in an oblique direction to support more.

Mounting members 121 are also formed at the ends of the reinforcing members 120 and 120a, and the mounting members are also provided in casings 1 and 3 of the offshore sand compaction pile working line A. It is welded to the side.

At this time, the mounting members 111 and 121 formed at both end surfaces of the loading main body 110 and at both ends of the reinforcing members 120 and 120a are curved in shape so as to be in close contact with the casings B and D. It is preferable to form so that it has the parts 111a and 121a.

The mounting members 111 and 121 are welded to the outer circumferential surfaces of the casings B and D to maintain the attached state. When the mounting members 111 and 121 work with the offshore sand compaction pile working line A, the present invention static load test apparatus 100 is used. It is a configuration necessary to combine the static load test device 100 only when the test to be removed from the static load.

Of course, the mounting members (111, 121) will be obvious that the offshore sand compaction pile work line (A) is formed so as not to interfere when working.

The loading body 110, the reinforcing members (120, 120a) and the mounting members (111, 121) is to be fastened by bolts and nuts to facilitate the coupling and separation in order to increase the convenience of detachment, attachment and universality of use desirable.

As shown in FIG. 3, a casing seating portion 112 is formed at the upper center portion of the loading main body 110 to place the casing C on the second, and the casing seating portion 2 is placed during the static load test. (C) was placed so that the load transmitted from the lower part of the loading body could be canceled out.

The hydraulic member 130 is to measure the bearing force of the pile (E) by generating a load in the downward direction in the static load test, it is driven by a well-known hydraulic unit such as a hydraulic pump and a hydraulic cylinder can be precisely controlled In addition, the measurement can be performed by the load cell. At this time, the hydraulic member 130 is controlled by a hydraulic pump, it is preferable to use a hydraulic jack having a load cell that can generate a large force.

The compression member 140 is a configuration for directly transferring the load generated from the hydraulic member 130 to the pile (E) of the sea bottom, the plurality of reinforcement plate 141 is disposed so as to cross horizontally and vertically therein. This allows it to withstand loads and impacts.

At this time, a plurality of drain holes 142 are formed on the outer circumferential surface of the compression member, which allows the sea water to circulate through the drain holes to minimize buoyancy and frictional resistance of the sea water.

Thus, the present static loading test apparatus 100 mounted on the casing of the marine sand compaction pile work line A is supported by the first and third casings which can minimize the frequent flow and shaking due to the characteristics of the sea. Since it is inserted into the surface, it is possible to prevent the shaking that can occur during the static load test, and to transmit a uniform load to the pile (E) to enable accurate static load test.

Referring to the present invention having the configuration as described above for each step as shown in Figure 4 as follows.

In the static load test method using the static load test apparatus 100 as described above, first, the position of the pile E to be tested is determined, and when the position of the pile E is determined, the offshore sand compaction file working line ( Penetrating the first casing (B) and the third casing (D) of the A) to the sea bottom, and the step of installing the standing test device 100 on the mounting members 111 and 121 formed in the casing, and the installation is completed Positioning the compression member 130 in the static load test device on the top of the pile (E) and operating the hydraulic member 130 to apply a load to the pile to the compression member, the load of the compression member transmitted to the pile According to the step of measuring the displacement amount of the pile.

At this time, the position of the pile (E) can be confirmed by using a GPS (geography imformation system) or by a diver.

Therefore, the static load test method of the present invention can immediately measure the amount of displacement of the pile according to the load of the compression member delivered to the constructed pile to determine the bearing capacity of the pile quickly, and by analyzing the measurement data using various analysis methods It will improve the construction quality of sand pillars for strengthening seabed soft ground and prevent bad construction.

Thus, the present static load test method is made possible by the present static load test apparatus 100 installed on the well-known marine sand compaction pile working line (A), so that the position measurement and movement to the sea are easy and the rapid static load test is possible. It is possible to remarkably shorten the measurement period, and after finishing the loading test, the loading body is separated from the mounting member attached to the casing, and the sea sand compaction pile working line (A) is again used to reinforce the soft ground. You can use it.

As described above, the present invention is capable of performing a static load test using a marine sand compaction file work line, so that the position measurement and movement can be easily performed, and a quick and efficient static load test can be performed, thereby shortening the measurement period and increasing work efficiency. .

In addition, the present static loading test apparatus can be removed and mounted on the offshore sand compaction pile working ship, so that both the static loading test and the soft ground reinforcement work can be performed, and thus the working ship can be used more efficiently. It is very economical because there is no need to manufacture ships and devices for testing only.

In particular, it is possible to measure the allowable bearing capacity and displacement through the pile load penetrated on the seabed while being supported by the first and third casings of the offshore sand compaction pile working ship. It is a very useful invention that can minimize the safety accident of the worker because it does not need to put the workers for installation and demolition of the heavy weight for the hand, and also reduce the cost of installing and removing the heavy weight.

Claims (4)

A mounting member welded to the inner side of the casing of the offshore sand compaction pile working ship, A loading body coupled between the mounting members; A hydraulic member mounted at the lower center of the loading body; The pile standing load testing device using the offshore sand compaction pile work line, characterized in that the compression member is located in the lower portion of the hydraulic member and movable up and down by the operation of the hydraulic member. According to claim 1, Pile loading test device using the offshore sand compaction pile work line, characterized in that the upper portion of the loading body is configured to be further formed in the oblique direction. According to claim 1 or 2, wherein the loading body and the reinforcing member is a pile using a marine sand compact pile work line, characterized in that configured to be coupled to the casing by a mounting member having a curved curved portion. Static load test device. In the static test method using a static test device, Identifying the location of the pile to be tested; Injecting the casings 1 and 3 of the offshore sand compaction pile work line into the sea bottom when the position of the pile is determined; Installing a static test apparatus on the casing; Positioning the compression member on the top of the pile and operating the hydraulic member of the static load testing device in which the installation is completed; The pile standing load test method using the offshore sand compaction pile working line, characterized in that the step of measuring the displacement of the pile in accordance with the load of the compression member transmitted to the pile.